Definition
The ratio between the load (resistance) moved by a simple machine and the effort (input force) applied to move it. It expresses how much a machine multiplies the force the operator puts in. A mechanical advantage greater than 1 means the machine multiplies force; less than 1 means it multiplies distance or speed instead.
Plain English
How many times a tool or machine multiplies the force you put into it. If you push with 10 pounds and the machine moves a 50-pound load, the mechanical advantage is 5.
Context Anchor
Seen in aircraft maintenance when using levers, jacks, pulleys, gears, presses, and other tools that help move or lift parts with less effort.
Derivation
From Latin 'mechanicus' (relating to machines) and 'advantage' (a gain or benefit). Together: the gain you get from using a machine. The word 'advantage' is the key — it tells you the machine is doing some of the work for you.
Why Pilots Care
Knowing mechanical advantage lets technicians choose the right tool and apply force safely without damaging aircraft parts or risking injury.
Analogy
A long-handled wrench gives your hand more turning effect than a short wrench. You push with about the same force, but the longer handle gives you more force at the fastener.
Intuition Check
Mechanical advantage does not mean a tool is simply “better.” Here it means a specific force gain: the tool gives more output force than the input force applied, with a tradeoff in distance or movement.
Example Sentence 1
By using a longer breaker bar, the technician increased the mechanical advantage and broke the seized bolt loose without damaging it.
Example Sentence 2
The jack under the wing uses mechanical advantage so one person can lift the aircraft safely.